极端相对论性高能核碰撞的〈pr〉分布

<PT> Distribution in Ultrarelativistic Nuclear Collisions

本文以蒙特卡罗方法计算SU(3)群格点规范得到的能密函数作为状态方程,用流体力学模型定量研究了极端相对论性高能核碰撞产生的终态粒子平均横动量<P_T>的分布,并与JACEE实验组的数据比较,发现在初态能量密度较大的区域里看到<P_T>异常剧增现象不是由夸克胶子等离子体的流体运动所引起。文中给出了不同初始热平衡时间和初始半径下的<P_T>分布对比数据,发现<P_T>分布的基本特征不因初始参数的变化而改变。

The distribution of average transverse-momentum <p_T> of secondary particles produced in the central region of ultrarelativistic nuclear collisions is studied quantatively with the hydrodynamic model and is compared with JACEE data. The energy density function in SU(3) gauge theory given by Monte-Carlo Calculation is employed to describe the state of the hot matter after collision. It is found that the abnormal rapid rise of <p_T> at high initial energy density region is not from the hydrodynamic motion of quark-gluon plasma. The <r_T> distributions with different initial thermal time and initial radius have been discussed in detail, the main character of <p_T> distribution does not change with the variation of initial parameters.